He gave a sign - A sign of this kind - an immediate prophecy to prove the divine character of a remote prophecy - had scarcely been given before this. In the later history, however, such signs are not unfrequent (compare 2 Kings 19:29; Isaiah 7:14-16).

The ashes ... shall be poured out - i. e., "The half-burnt remains of the offerings shall be ignominiously spilled upon the ground."

And he gave a sign - A miracle to prove that the prophecy should be fulfilled in its season.

And he gave a sign the same day, saying, this is the sign which the Lord hath spoken,.... As a confirmation of the truth of what the prophet had said, and for the proof of his being a true prophet of the Lord:

behold, the altar shall be rent; of itself, by an invisible hand, by the power of God:

and the ashes that are upon it shall be poured out; signifying it should be entirely demolished, not only shaken but destroyed, so as not to be capable of retaining the ashes on it; this was an emblem of the utter abolition of idolatry here in future times.

In confirmation of his word the prophet added a miracle (מופת, τέρας, portentum, see at Exodus 4:21): "this is the sign that the Lord hath spoken (through me): behold the altar will be rent in pieces, and the ashes upon it will be poured out." דּשׁן is the ashes of the fat of the sacrificial animals. The pouring out of the sacrificial ashes in consequence of the breaking upon of the altar was a penal sign, which indicated, along with the destruction of the altar, the desecration of the sacrificial service performed upon it.

And he gave a sign the same day, saying, This is the {c} sign which the LORD hath spoken; Behold, the altar shall be rent, and the ashes that are upon it shall be poured out.

(c) By this sign you will know that the Lord has sent me.

13:3 Gave a sign - That is, he then wrought a miracle, to assure them of the truth of his prophecy.

13:1-10 In threatening the altar, the prophet threatens the founder and worshippers. Idolatrous worship will not continue, but the word of the Lord will endure for ever. The prediction plainly declared that the family of David would continue, and support true religion, when the ten tribes would not be able to resist them. If God, in justice, harden the hearts of sinners, so that the hand they have stretched out in sin they cannot pull in again by repentance, that is a spiritual judgment, represented by this, and much more dreadful. Jeroboam looked for help, not from his calves, but from God only, from his power, and his favour. The time may come when those that hate the preaching, would be glad of the prayers of faithful ministers. Jeroboam does not desire the prophet to pray that his sin might be pardoned, and his heart changed, but only that his hand might be restored. He seemed affected for the present with both the judgment and the mercy, but the impression wore off. God forbade his messenger to eat or drink in Bethel, to show his detestation of their idolatry and apostacy from God, and to teach us not to have fellowship with the works of darkness. Those have not learned self-denial, who cannot forbear one forbidden meal.